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THERE IS THE SAME DANGER IN ISTANBUL
Stating that structures built on alluvial floors were exposed to soil amplification during the earthquake, Prof. Dr. Yaltırak also explained the seismic effect of the soil as follows:
“What we call the intensity of the earthquake is the resulting tremor or vibration force. Buildings with increased area vibrate and shake longer, while structures on solid ground with the least increase in area or no increase in area shake less. The increase in the earthquake is clearly seen in the video footage of Rıza Bey’s apartment, which was destroyed in Bayraklı. The column explodes in the 40 second of the earthquake. Obviously, the column on the ground floor of the building has been cut. When the column in the corner explodes, the building collapses as is. Normally, if the rock is ground, the oscillation would take 15 seconds, but there is 45 seconds of oscillation on the ground like mush. There is also a long-lasting danger of oscillations in the Istanbul terrain similar to Bayraklı.
HUMAN FILLERS
Prof. Dr. Yaltırak’s determinations regarding the risk areas of Istanbul in terms of terrain are as follows: “The layer we call soft clay is dominant in the alluvial valley. The soil in the section that runs from Silivri to Beylikdüzü is soft, which will cause a seismic increase. The soil in the region is made up of clay, coal, sand, and gravel. Earthquake waves can cause a significant rise in the ground. Since the coast of Bakırköy and Ataköy is a region formed by alluvium, it is a place that carries terrestrial risks. The Kurbağalıdere and Kuşdili regions in Kadıköy are also places with dangerous terrain made of clay and mud.
This soft coating can create earthquake amplification. Kasımpaşa, Beşiktaş, Göktürk and Vatan Caddesi are among the places that are not talked about and whose terrain is risky. Artificial infill areas in Istanbul are also very risky. “
